Year	Index
1980	6.573
1981	7.009
1982	7.377
1983	8.313
1984	9.199
1985	10.346
1986	11.576
1987	11.942
1988	12.974
1989	14.365
1990	21.17
1991	26.652
1992	35.101
1993	42.297
1994	54.563
1995	70.823
1996	84.067
1997	88.859
1998	93.258
1999	95.682
2000	95.969
2001	100
2002	102.1
2003	107.78
2004	110.14
2005	111.49
2006	115.77
2007	121.33
2008	127.23
2009	134.55
2010	138.216
2011	145.348
2012	158.48
2013	160.3
2014	168.72
2015	176.08
2016	188.33
2017	197.62
2018	202.956
2019	211.48
2020	231.359
2021	244.084
2022	276.059
2023	305.873
2024	341.966